Abstract
Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
| Original language | English |
|---|---|
| Pages (from-to) | 1574-1580 |
| Number of pages | 7 |
| Journal | Materials Research Bulletin |
| Volume | 45 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2010 |
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Keywords
- A. Oxides
- C. Neutron scattering
- D. Dielectric properties
- D. Magnetic properties
- E. EXAFS
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy). / Yoshii, Kenji; Hiramitsu, Yusuke; Okajima, Yuka; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Jun'Ichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu; Morii, Yukio; Ikeda, Naoshi.
In: Materials Research Bulletin, Vol. 45, No. 11, 11.2010, p. 1574-1580.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Magnetic and dielectric study of R0.5Sr0.5MnO 3 (R = Gd, Tb and Dy)
AU - Yoshii, Kenji
AU - Hiramitsu, Yusuke
AU - Okajima, Yuka
AU - Yoneda, Yasuhiro
AU - Nishihata, Yasuo
AU - Mizuki, Jun'Ichiro
AU - Nakamura, Akio
AU - Shimojo, Yutaka
AU - Ishii, Yoshinobu
AU - Morii, Yukio
AU - Ikeda, Naoshi
PY - 2010/11
Y1 - 2010/11
N2 - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
AB - Magnetic and dielectric properties of perovskite manganites R 0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr 3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000-10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this sysstem are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
KW - A. Oxides
KW - C. Neutron scattering
KW - D. Dielectric properties
KW - D. Magnetic properties
KW - E. EXAFS
UR - http://www.scopus.com/inward/record.url?scp=77957309671&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77957309671&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2010.07.024
DO - 10.1016/j.materresbull.2010.07.024
M3 - Article
AN - SCOPUS:77957309671
VL - 45
SP - 1574
EP - 1580
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 11
ER -